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Hi my name is Robert...
I would check in the following ares, near the hydraulic pump'/motor, there should be a fuse, go to the battery cable and follow the smaller gauge wires and look for a fuse and then I would check your chassis fuse box and make sure you do not have a fuse blown, if the fuse box is not marked I would get a 12 volt test light, turn the ignition ON and probe each fuse for power. It is a quick and easy way to check the fuses. Click HERE and see the lower pages it will give you an idea of where the fuses should be located, hope this helps some.... Robert
Please keep in mind I have no idea what you have checked, the manual will show the wiring and fuse locations. I have worked on thousands of different RV'S and things are always different per RV, the system requires ignition power to turn on so I would find the fuses that are hot with the ignition and go from there. IT really sounds like you have a tripped fuse or breaker.... Robert